/Engine/Source/Runtime/Engine/Classes/Particles/ParticleLODLevel.h
Sets the LOD 'Level' to the given value, properly updating the modules LOD validity settings. This function assumes that any error-checking of values was done by the caller! It also assumes that when inserting an LOD level, indices will be shifted from lowest to highest... When removing one, the will go from highest to lowest.
virtual void SetLevelIndex ( int32 InLevelIndex )